Kitchen sink



FIG. 1 is a top, front and left side perspective view of a kitchen sink showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken line representation of fitting mounting openings in FIGS. 1, 2 and 7 are for purposes of illustration only and form no part of the claimed design. 

The ornamental design for a kitchen sink, as shown and described. 